	//图片上传预览    IE是用了滤镜。
function previewImage(file,name) {
	console.log(file);
    var MAXWIDTH = 100;
    var MAXHEIGHT = 100;
    var div = document.getElementById('preview'+name);
    if (file.files && file.files[0]) {
        div.innerHTML = '<img id=imghead'+name+' onclick=$("#previewImg"'+name+').click()>';
        var img = document.getElementById('imghead'+name);
        img.onload = function() {
            var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
            img.width = rect.width;
            img.height = rect.height;
            img.style.marginTop = rect.top + 'px';
        }
        var reader = new FileReader();
        reader.onload = function(evt) {
            img.src = evt.target.result;
        }
        reader.readAsDataURL(file.files[0]);
    } else //兼容IE
    {
        var sFilter = 'filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="';
        file.select();
        var src = document.selection.createRange().text;
        console.log(src);
        div.innerHTML = '<img id=imghead'+name+'>';
        var img = document.getElementById('imghead'+name);
        img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;
        var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
        status = ('rect:' + rect.top + ',' + rect.left + ',' + rect.width + ',' + rect.height);
        div.innerHTML = "<div id=divhead style='width:" + rect.width + "px;height:" + rect.height + "px;margin-top:" + rect.top + "px;" + sFilter + src + "\"'></div>";
    }
}
			function clacImgZoomParam(maxWidth, maxHeight, width, height) {
			    var param = {
			        top: 0,
			        left: 0,
			        width: width,
			        height: height
			    };
			    if (width > maxWidth || height > maxHeight) {
			        rateWidth = width / maxWidth;
			        rateHeight = height / maxHeight;
			
			        if (rateWidth > rateHeight) {
			            param.width = maxWidth;
			            param.height = Math.round(height / rateWidth);
			        } else {
			            param.width = Math.round(width / rateHeight);
			            param.height = maxHeight;
			        }
			    }
			    param.left = Math.round((maxWidth - param.width) / 2);
			    param.top = Math.round((maxHeight - param.height) / 2);
			    return param;
			};